Stainless steel surface passivation treatment solution and method

A passivation treatment, stainless steel technology, applied in the direction of anodic oxidation, etc., can solve the problem of small pressure, etc., to achieve the effect of improving corrosion resistance, good reproducibility, and convenient operation

Active Publication Date: 2017-05-10
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of these treatment solutions contain strong acids such as sulfuric acid with high c

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A kind of stainless steel surface passivation treatment liquid of the present invention comprises: rare earth metal salt, silicate and oxidant, wherein, rare earth metal salt is cerium sulfate, silicate is sodium silicate, oxidant is potassium permanganate, and above-mentioned The substance was added to a certain amount of distilled water, and stirred thoroughly until all the solid substances were dissolved.

[0025] The specific composition of the passivation treatment solution is shown in Table 1.

[0026] Table 1 Composition of passivation treatment solution

[0027] Cerium Sulfate Sodium silicate potassium permanganate 0.05 mol·L -1

0.004 mol·L -1

10g L -1

[0028] A stainless steel surface passivation treatment method, the method uses stainless steel as the working electrode in the three-electrode system, the working electrode is placed in the above-mentioned passivation treatment solution, and the three-electrode system conne...

Embodiment 2

[0033] A kind of stainless steel surface passivation treatment liquid of the present invention comprises: rare earth metal salt, silicate and oxidant, wherein, rare earth metal salt is cerium sulfate, silicate is sodium silicate, oxidant is potassium permanganate, and above-mentioned The substance was added to a certain amount of distilled water, and stirred thoroughly until all the solid substances were dissolved.

[0034] The specific composition of the passivation treatment solution is shown in Table 2.

[0035] Table 2 Composition of passivation treatment solution

[0036] Cerium Sulfate Sodium silicate potassium permanganate 0.08 mol·L -1

0.002 mol·L -1

15g L -1

[0037] A stainless steel surface passivation treatment method, the method uses stainless steel as the working electrode in the three-electrode system, the working electrode is placed in the passivation treatment solution described in claim 1 or 2, and the composition of the...

Embodiment 3

[0042] A kind of stainless steel surface passivation treatment liquid of the present invention comprises: rare earth metal salt, silicate and oxidant, wherein, rare earth metal salt is cerium sulfate, silicate is sodium silicate, oxidant is potassium permanganate, and above-mentioned The substance was added to a certain amount of distilled water, and stirred thoroughly until all the solid substances were dissolved.

[0043] The specific composition of the passivation treatment solution is shown in Table 3.

[0044] Table 3 Composition of passivation treatment solution

[0045] Cerium Sulfate Sodium silicate potassium permanganate 0.1 mol·L -1

0.005 mol·L -1

5 g L -1

[0046] A stainless steel surface passivation treatment method, the method uses stainless steel as the working electrode in the three-electrode system, the working electrode is placed in the passivation treatment solution described in claim 1 or 2, and the composition of the ...

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PUM

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Abstract

The invention provides a stainless steel surface passivation treatment solution and method, and belongs to the field of surface treatment of metal materials. The passivation treatment solution comprises rare earth metal salt, silicate and an oxidizing agent, wherein the rare earth metal salt is cerium sulfate, the silicate is sodium silicate, and the oxidizing agent is potassium permanganate; and the above substances are added into a certain amount of distilled water and fully stirred until the solid substances are completely dissolved. According to the stainless steel surface passivation treatment solution and method, stainless steel is used as a working electrode, is placed in the passivation treatment solution, and forms a three-electrode system along with a reference electrode and a counter electrode, the working electrode is subjected to anodic oxidation, a passivation film layer is formed on the surface of the stainless steel, and passivation treatment on the surface of the stainless steel is realized. The passivation treatment solution does not contain hexavalent chromium or highly corrosive acids such as sulfuric acid, nitric acid and hydrochloric acid, is simple in preparation process, low in cost, good in reproducibility and free of large expensive equipment. The prepared passivation film layer can be applied to the fields of stainless steel product surface treatment and the like, the corrosion resistance of the stainless steel is obviously improved, and the service life of the stainless steel is prolonged.

Description

technical field [0001] The invention discloses a passivation treatment solution and a treatment method capable of preparing a corrosion-resistant film layer on the surface of stainless steel. The treatment solution and the method are suitable for surface treatment of stainless steel and belong to the technical field of surface treatment of metal materials. Background technique [0002] Metal corrosion brings huge losses to the national economy every year. Common metal corrosion protection methods include making corrosion-resistant alloys and coatings. Common elements used to prepare alloys include nickel (Ni), chromium (Cr), silicon (Si), molybdenum (Mo), and the like. Stainless steel is a common steel material with strong corrosion resistance, which is composed of iron, nickel, chromium and other elements. Stainless steel has excellent characteristics such as unique strength, high wear resistance, superior anti-corrosion performance and not easy to rust. Therefore, it is...

Claims

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Application Information

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IPC IPC(8): C25D11/34
CPCC25D11/34
Inventor 林志峰李相波许立坤
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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